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WELD APPEARANCE
Weld appearance of Super Alloys can be somewhat
misleading when visually compared with any hygienic
weld made in 316L stainless steel. A typical Hastelloy
C-22 weld will have oxide islands in the weld bead.
These films that form in the weld pool and solidify on
the weld have been identified as high-melting-point
nonmetallic oxides. Oxide islands are common, and the
appearance is permitted in standards such as ASME
BPE. Discoloration in the heat-aected zone (HAZ)
is also expected and is not necessarily the result of
improper gas shielding. Discoloration in the HAZ can be
caused by tube mill surface conditioning processes such
as pickling, passivation, mechanical polishing, cleaning,
and/or annealing furnace atmosphere. Discoloration in
the HAZ from these processes is generally darker than
it is in traditional stainless steel materials, but it does not
indicate an improper weld.
HASTELLOY
C-22 ID WELD
HASTELLOY
C-22 OD WELD
